1.) Which of the following statement best describes how bacteriain a hot spring control the fluidity of their plasma membrane?
They decrease the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane
Because they don't synthesize cholesterol, they cannot controlmembrane fluidity and therefore have a very fluid plasmamembrane.
They use cholesterol to prevent membranes from becoming toofluid.
They form lipid rafts to prevent too much fluidity
They increase the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane.
2.) Which activity can only be done by a transmembraneprotein?
To be phosphorylated
To signal from one side of the membrane to the other
To be glycosylated
To associate with other proteins
To bind transiently to a lipid bilayer
1.) Which of the following statement best describes how bacteriain a hot spring control the fluidity of their plasma membrane?
They decrease the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane |
Because they don't synthesize cholesterol, they cannot controlmembrane fluidity and therefore have a very fluid plasmamembrane. |
They use cholesterol to prevent membranes from becoming toofluid. |
| They form lipid rafts to prevent too much fluidity |
They increase the percentage of lipids with unsaturatedhydrocarbon chains in their plasma membrane. |
2.) Which activity can only be done by a transmembraneprotein?
| To be phosphorylated |
| To signal from one side of the membrane to the other |
| To be glycosylated |
| To associate with other proteins |
| To bind transiently to a lipid bilayer |
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I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and on Questions 6 and 9 please help me with it hope you can help me with the correct answers please
Question 5
At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......
| less fluid |
| more fluid |
| fluidity will be unchanged |
Question 6
Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane
| high proportions of saturated phospholipids |
| high proportions of unsaturated phospholipids |
| an equal ratio of saturated to unsaturated phospholipid |
Question 7
Membrane proteins have an important role in membrane fluidity
| True |
| False |
Question 8
The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?
| europeans because their ancestors survived the bubonic plague |
| North Americans because their ancestors survived small pox |
| europeans because they have a longer evolutionary past with HIV |
| Africans because they have a longer evolutionary past with HIV |
Question 9
Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax
Question 10
Diffusion requires energy
| True |
| False |
Question 11
The net direction of molecule movement when molecules diffuse is
| down their concentration gradient |
| random directions |
Question 12
In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?
| True |
| False |
Question 13
Which best defines osmosis?
| In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration? |
| In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration? |
Question 14
Animal cells placed into a hypotonic solution would most likely?
| lyse (burst) |
| shrink |
| remain unchanged in size |
Question 15
Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids
| True |
| False |
Question 16
ATP powered pumps move substances into and out of cells by diffusion?
| True |
| False |
Question 17
For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.
| True |
| False |
Question 18
Bulk transport of fluid and any of the substances within that fluid is called
| pinocytosis |
| phagocytosis |
| receptor-mediated endocytosis |
| exocytosis |
I have this questions for my homework i need help with them look please it is important i need help so please give me the correct answers for each question and also please be clear to understand and aslo be correct it is very important becuase i need them so i really need the right answers. please help me and be correct and clear it is important ok
Question 5
At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......
| less fluid |
| more fluid |
| fluidity will be unchanged |
Question 6
Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane
| high proportions of saturated phospholipids |
| high proportions of unsaturated phospholipids |
| an equal ratio of saturated to unsaturated phospholipid |
Question 7
Membrane proteins have an important role in membrane fluidity
| True |
| False |
Question 8
The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?
| europeans because their ancestors survived the bubonic plague |
| North Americans because their ancestors survived small pox |
| europeans because they have a longer evolutionary past with HIV |
| Africans because they have a longer evolutionary past with HIV |
Question 9
Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax
Question 10
Diffusion requires energy
| True |
| False |
Question 11
The net direction of molecule movement when molecules diffuse is
| down their concentration gradient |
| random directions |
Question 12
In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?
| True |
| False |
Question 13
Which best defines osmosis?
| In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration? |
| In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration? |
Question 14
Animal cells placed into a hypotonic solution would most likely?
| lyse (burst) |
| shrink |
| remain unchanged in size |
Question 15
Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids
| True |
| False |
Question 16
ATP powered pumps move substances into and out of cells by diffusion?
| True |
| False |
Question 17
For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.
| True |
| False |
Question 18
Bulk transport of fluid and any of the substances within that fluid is called
| pinocytosis |
| phagocytosis |
| receptor-mediated endocytosis |
| exocytosis |